Typewriting-machine



A. J. DUDLEY.

TYPEWRITING MACHINE.

APPLICATION FILED NOV. 16. 1920.

1,394,614., Patented Oct. 25, 1921.

3 SHEETS-SHEET I.

WITNESSES INVENTUR W (ASH-p A?2M;

HIS ATTURNEY Patented Oct. 25, 1921.,

3 SHEETS-SHEET 2.

'INVENTUR 43A fi'dki HE ATTUHNEY A. J. DUDLEY.

TYPEWRITING MACHINE.

APPLICATION FILED NOV. 16, 1920.

Patented Oct. 25, 1921.

3 SHEETSSHEET 3.

MW em m wl WITNESSES Kw- K/UTSFDMQ INVENTUR WW w w i Hi5 ATTURNEY T D ST ES PATENT OFFICE.

ARTHUR J. DUDLEY, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO REMINGTON TYPE- WRITER COMPANY, ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPEWRI'IING-MACHIN E.

Specification of Letters Patent.

Patented Oct. 25, 1921.

Application filed November 16, 1920. Serial No. 424,523.

To all whom it may concern:

Be it known that I, ARTHUR J. DUDLEY, citizen of the United States, and resident of Jersey City, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Typewriting-Machines, of which the following is a specification.

My present invention relates to escapement devices for typewriting machines and its principal object is to provide new and improved escapement devices which are particularly adapted to cure defects heretofore encountered when the space key of the machine has been operated.

To the above and other ends, which will hereinafter appear, my present invention consists in features of construction, combinations of devices and arrangements of parts hereinafter described and particularly pointed out in the claims.

In carrying out my invention in the present instance I provide a dog carrier or rocker carrying dog devices which when actuated from the printing keys of the machine cooperate with the usual circular rack or escapement wheel to give an ordinary orv no drop escapement ofv the traveling platen carriage during return movements of said printing keys. The rocker comprises two leaves or parts, one of which carries a holding dog and the other both a stepping dog and a third dog, the latter part alone being caused to vibrate when the space key or. bar is actuated; During such vibration the leaf or portion of the dog rocker carrying the holding dog or tooth remains stationary or fixed. Under the operation of the space key the spacing action is as follows :The stepping dog is vibrated from underthe escapement wheel tooth allowing the wheel to turn so that said tooth may engage with the third dog and press it backward giving a full-drop or reverse feed. In the present construction two rocker springs areemployed, one for holding the leaf carrying the holding dog back against a stop, which leaf for convenience may be called the main dog rocker part. The other spring holds the second leaf or supplementary rocker part. against said main part. The primary purpose of this novel construction is to prevent what is called a spread; that is, the striking of the first character of a .word at the point on the paper which should be a space. When, as is usual, the space key as well as the printing keys is employed to actuate the ordinary or no drop escapement, no movement of the-carriage has been afi'orded on the downstroke or depression of the key, resulting in a slow operation because of the fact that operators are not so speedy with the thumb as with the fingers, and the thumb is commonly employed to actuate the space key. Furthermore there is a common tendency on the part of operators to dwell on the space key. The consequence is that spreads are quite common in typewriting. My present invention resides as appears from the foregoing, in so constructing the escapement mechanism that when the printing keys are actuated it will operate as an ordinary escapement affording a letter space movement on or during a return stroke of the printing keys, but when the space key is operated, the escapement movement takes place during the down stroke of the space key, resulting in what is called a full drop or reverse feed escapement. My improved construction will be more specifically described in connection with the accompanying drawings wherein Figure 1 is a fragmentary front to rear vertical sectional view of a typewriting machine embodying the preferred form of my present invention.

Fig. 2 is a vertical sectional view, on an enlarged scale, taken on a plane indicated by the dotted line tt in Fig. 1 and looking forward.

- Fig. 3 is a horizontal sectional view taken on a plane indicated by the, dotted line v'v in Fig. 2.

Fig. 4 is a view corresponding to Fig. 2 but omitting some of the parts shown in said Fig. 2 and showing other parts in difierent relationships.

Fig. 5 is a fragmentary view corresponding to Fig. 2 but showing different relationships of some of the parts.

Fig. 6 is a vertical sectional view, taken on a plane indicated by the dotted line w w in Fig. 2 and looking in the direction of the arrow at said line. Fig. 7 is a vertical sectional view taken on a plane indicated by the dotted line 90 in Fig. 5 and looking in the direction of the arrow at said line.

Fig. 8 is a perspective view of the dog rocker with its leaves swung apart.

the escapement wheel teeth in relation to certain of the dogs at different stages, Figs.

9 and 11 corresponding to the relationship of the parts as shown in Figs. 1 and 2, and Figs. 10 and 12 correspondmg to the relationship of the parts asshown respectlvely in Figs. 4 and 5.

As appears from Fi 1, the main frame of the typewriting mac ine to whlch my n vention is shown as applied, comprises slde plates or frames 1 which are connected at the front by a U-shaped frame 2 that incloses the keyboard, and at the rear; by a cross plate, not shown but which is rigidly connected to the side frames. Mounted for reciprocation above the main frame is a traveling laten carriage which comprlses an inclined p ate or bar 3 to the ends of which are secured forwardly extending end plates 4. The top and bottom of the plate 3 are formed with grooved seats 5 which receive sets of anti-friction rollers 6. The upper set of rollers 6 cofiperates with agrooved seat formed in a stationary guide bar 7 which extends crosswise of the machine and is secured by screws 8 to the upper end portion of an angular bed plate or support 9 fixed at the top of the mam frame. The bed plate 9 has a forwardly extending horizontal portion terminating in an upward extension 9 formed with a rooved seat for the lower set of rollers 6. ournaled on the carriage 3-4 is a roller'platen 10 with whose front face coiiperate type bars 11, the set of type bars being arranged in an arc of a circle below the platen and being normally horizontally dlsposed, their free ends resting on a curved ad 12 mounted on a rest or support 13. he set of type bars have a common pivot wire 14 which is mounted on a vertical segment 15. Each type bar is provided with a contact face 16 for cotiper-- ation with carriage feeding or escapement devices and has an inclined or cam slot 17 engaged by a headed pin 18 projecting laterally from the free end of the longer arm of a bell crank 19, the series of bell cranks 19 being arranged in guide slots 20 on the support 13 and being pivoted on a common pivot wire 21 mounted on said support. The shorter arm of each bell crank 19 is-connected by a link 22 with an angular lever 23 pivoted at 24 in a sub-frame 25, detachably mounted on the lower portion of the mam frame. Each lever 23 is rovided with a headed pin 26 engaging in s 0t 27 in a key lever 28, the set of key levers being pivoted on fulcrum w1res 29 on the subframe 25, and extend forward therefrom the connected levers 23 causing the associate links 22 to swing bell cranks 19 so that the releasin John actuating pins 18-. will operate the type bars 11, swinging the latter upward and rearward into operative contact with the platen 10. During printing movements the type bars Wlll actuate the carriage feeding'or escapement device which are connected to. the carrlage through a feed rack 31 mounted on the carriage and constantly meshing with a feed pinion 32 mounted loosel on a horizontal shaft 33, the ends of whic are provided with ball bearings, not shown but which are housed in .ball cups 34 and 35 adjustahly secured in lugs 36 and 37 integral with and depending from the middle portion of the bed plate 9. The shaft 33 is provided with an integral flange 38 to which is fixed as by rivets 39 an escapement wheel or circular rack 40 having teeth or engaging portions 41. During le tward movements of the carriage under the impulse of the spring drum or carriage motor (not shown) the rack 31 will rotate the pinion 32, which will transmit movement to the escapement wheel 40 through devices comprising a spring mounted pawl 42 that is pivoted to the front face of the escapement wheel and is so related to the pinion '32 that durin the return or rightward movements of t e carriage and corresponding rotations of the pinion, said pawl will cllck idly over the P1111011 teeth, and the escapement wheel at such times will remain motionless, being held by the escapement dog mechanism. The connections between the feed pinion and the escapement wheel need not be more fully described since they, together with the escapement wheel mechanism, are the invention of Barr and are fully disclosed and claimed in his application Serial No. 423,629 filed Nov. 12, 1920. y

The dogcarrier or rocker, designated as a whole by the numeral 43 and shown detached in Fig. 8, comprises two parts" or leaves 44 and 45 which are so connected or hinged together that they may swing or vibrate as one piece and are also relatively movable transversely of the escapement wheel. The part 44 which may be called the main part, comprises an u r1 ht plate-like.

or leaf portion 46 from t e ower end of whlch opposite] project lateral bearing portions 47. Fixe to and preferably integral with the leaf portion is a holding dog 48, said holding dog being in the form of a lug projecting u ward from the top of the leaf portion and aving a beveled engaging face 49 cooperative with the teeth of the escapement wheel. The leaf portion is also provided with forwardly projecting screw stops 50 and 51 and carries a spring mounted detent 52 ivoted at 53, the upper end portion of whic is cooperative with the teeth of the escapement wheel to regulate the turning of said wheel, the lower end or tail of said detent being constantly-pressed outward by a.

side of the leaf portion 0 spring 54 which normally maintains a stop nose 55 in contactive engagement with the the part 43. The main leaf or part 44 also carries a depending lug 56 from which projects rearward a pin 57. The bearing portions 47 of the main part are perforated to receive a bearing shaft or rod 58. The supplementaldog rocker part 45 comprises an upstanding plate or leaf portion 59 from the lower end of which ears 60 are bent forward at right angles. Said ears are perforated to bear on the rod 58 and are confined between the bearing portions 47 of the'main dog part so that relative lateral displacement of the two dog parts is prevented. The leaf part 59 supports a stepping dog member 61 pivoted at 62 to the rear face of the plate 59 and comprising an upright arm 63 terminating in a tooth or detent 64 which normally engages with one of the teeth of the escapement wheel, the back face of the dog tooth 64 being beveled for clearance as is usual. The member 61 is provided with a tail portion 65 to which is connected the lower end of a coiled spring 66, the other end of said spring being connected to a third dog member 67 which is provided at its lower end with an ear 68 overlapping the rear face of the plate 59 and perforated to bear on a pivot screw 69 carried by said plate. The upper end of the dog member 67 is provided with a tooth or dog proper 70 which is offset forward into the plane of the holding dog 48 and normally has its engaging face contiguous to the back face of said holding dog. Projecting leftward and downward from the upper end of the dog member 67 is a strap portion 71 terminating in an angularly bent engaging portion 72 which is adapted to 'coperatej with the rear side of the dog 64 when the latter is released. The tendency of the spring 66 is constantly to swing the dog member 67 leftward about its pivot and to maintain it in contact with an adjustable stop 73 projecting forward from the plate 59. The spring 66 also acts on the tail 65 tending to turn the dog member 61 on its pivot, and operates to swing the dog tooth 64 leftward when the latter is freed from the escapement wheel by operation of the keys, such leftward movement being limited by the on aging or stop portion 72 of the third dog. Tn other words, the spring 66 acts as a spring for both the stepping dog and the third dog, tending constantly to swing them leftward. The swinging movements of the third dog are guided by a finger or projection 74 on the leaf 59. screw stop 75 carried by the plate 59 projects forward therefrom and is adapted to contact with the plate 46 to limit the movement of the two plates toward each other. The screw stop 75 is disposed at the left-hand side of the plate 59 and near its top below and somewhat to the right of a finger 76 terminating in a head 77, said finger extending upward from the left-hand offset portion of the plate 59.

The dog rocker as a whole, comprising the two pivotally connected leaves 44 and 45 and the parts carried by them, is pivotally mounted or supported on screws or pivots 78 having conedends 79 which engage in cone shaped depressions 80 in the ends of the rod or' shaft 58, Figs. 1 and 2. The pivot pins 78 are carried at the lower ends of arms 81 which depend from the bottom of the bed plate 9 and are preferably integral. therewith, being arranged at the left and rlght sides of a cut-out 9 in said bed plate, wherein are arranged the escapement wheel 40 and associate parts. The screws or pivots 78 are secured in the lower ends of the lugs or arms 81 and are held in adjusted position as by check nut 82 and set screw 82. A coiled do rocker spring 83 is hooked at its lower en over the pin 57, the upper end of said spring being hooked into a hole indicated at 84 formed in the rear end of a horizontal arm 85 having a rightward extension or stop portion 86 and bent rearward from the top of a vertically disposed plate 87 that is secured by screws 88 to the left-hand arm 81 and pro ects inward therefrom. Said plate is best shown in Figs. 2, 3 and 6. The tendency of the rocker spring 83 is to throw or swing the dog rocker forward, maintaining the stop pin 50 normally in engagement with the rear face of the stop plate 87. The action of the spring 83 is transmitted directly to the main rocker part 44 with which it is connected and through it to the supplementary rocker part 45. The

two rocker parts are spring connected by a coiled draw spring 89, the rear end of which is hooked under the head 77 of the finger 76 and the forward end of which is anchored to a hooked portion 87 extending upward from the plate 87 The draw spring 89 tends constantly to maintain the stop pin 75 in contact with the face of the plate 46 and thus establishes a normal mutual relationship between the two plates 46 and 59, which relationship is maintained during the vibratory movements communicated to the dog rocker from the printing keys. WVith the do rocker as a whole in the normal position and with the stop 50 incontactive engagement with the stop plate 87, the stepping dog or tooth 64 lies in the plane of the escapement wheel 40 and is engaged by one of the teeth 41 of said wheel. Normally the dog spring 66 will be stretched or overcome and the dog tooth 64 will be maintained in engagemitted through the carriage feed rack 31, feed pinion 32 and pawl 42 to the escapement wheel 40 and tending to turn the wheel teeth 41'at the lower side thereof constantly in the direction indicated by the arrow 1n Fi s. 2, 4-and 5.

he two-part dog rocker and the parts mounted thereon'are adapted tobe swung or vibrated fore and aft of the machine when the printing keys are operated,'movement from the printing keys to the dog rocker being in the present instance transmitted through the type bars 11 whose contact faces 16 are adapted to cooperate with the front edge of a universal bar 90 illustrated in Fig. 1. The universal bar 0011- struction and the train of connections are the invention of another, for whom a separate application of Edwin E. Barney, Serial No. 427,589, filed Dec. 1, 1920, is made. Said universal bar is arcuate in shape and is housed in a seat or depression 91 in the rear of the type bar segment 15. Near its ends the universal bar has rearward extensions 92 which are pivotally connected at 93 with crank arms 94 fixed to a shaft 95 from which said crank arms project upward. Centrally the shaft 95 has a rearwardly extending crank arm 96. The lower middle portion of the universal bar 90 is provlded with a rearwardly extending arm 97 carrying a contact device or up-turned rear end portion 9.8, which is adapted to en age with the contact screw 51 on the dog roc er. The arm 97. has a downwardly extending slotted lug 99 that is engaged by a pin 100 carried by a crank arm 101 fixed to an axis 102 to which is also fixed a rearward crank arm 103, the latter being connected to the crank arm 96 by a synchronizing link 104. A universal bar spring 105 is connected to a pin 106 on the arm 97, the opposite end of said spring bein anchored to an adjustable nut 107 carried hy a screw 108 supported on an arm 109, fixed to and projecting downward behind the type bar segment 15. The spring 105 maintains the unlversal bar in normal position and the rocker spring 83 maintains the pin 51 contiguous to the contact device 98 so that when one of the printing keys is depressed it acts through the train of type bar actuating devicesto swing the connected type bar to printing position, and causes the contact face 16 of said type bar acting against the universal bar to move it rearward, this movement being transmitted through the contact device 51 to the dog rocker, both parts of which will be swung together rearward as a single element against the pull of the sprin 83. The rearward swingmg movement 0 the dog rocker carries it from the position illustrated in Fi 1, 2, 3 and 9 to the position illustrated in i igs. 4 and 10. As the dog rocker swings rearward the stepping or loose dog 64 will be swung out of the plane of the escapement wheel and the holding or beveled dog 48 will engage with the front edge of the tooth just released by the stepping dog, thus holdingthe escapement wheel from turning. As soon as the steppingdog has been freed from the engaged tooth 41 said dog will be swung on its individual pivot by spring 66 into contact with the engaging portion 72 by which said dog will be positioned to enter the tooth s ace behind the tooth 41 from which it he just disengaged. Consequently when the depressed printing key is released and starts to return, permitting the dog rocker to swing forward toward normal position under thev impulse of its spring 83, the escapement wheel, freed from the control of the holding dog 48, will turn in the direction of the arrow in Fig. 4, causing the dog tooth 64 to be engaged by the advancing wheel tool 41 and the dog member 61 to be swung on its pivot until arrested by engagement with the stop 73. This results in the completion of the escapement movement and the concurrent advance of the traveling carriage one space in letter feed direction, the entire letter feed or substantially the entire letter feed takin place during the return or upstroke of t e printing vkey. In other words, during the operation of the printing keys as described, the twopart dog rocker 43, do 48 and the dog 61, 64 mounted thereon w' l cooperate with the escapement wheel to provide an ordinary" or no drop escapement for the travelin carriage; that is, .an escapement which a ords step by-step letter feed movements of the carriage during upstrokes or return movements of the printin keys.

To lessen the liabi ity of spreads provision is made for operating the escapement differently from the space key or bar of the machine, such operation resulting in communicating vibratory movements to the dog rocker part 45 independently of the dog rocker part 44, which will remain motionless during such vibratory movements. The result is to bring the third dog 67 into use and to dispense with the holding dog 48 during the escapement operation. n the present instance the space key is in the form of a bar 110 which, as will be understood from Fig. 1, extends from side to side of the" machine forward of the printing keys and provides a cross connection for two levers 111, the bar 110 connecting the front ends of said levers which at their rear ends are fixedly secured to a rock shaft 112 bearing in brackets 113 fixed to the sub-frame 25. The pair of parallel s ace bar levers 111 (only the left-hand one o the pair being shown herein) and the cross bar 110 constitute with the rock shaft a spacing frame. Arranged about the middle of the rock shaft and extending rearward therefrom is a curved arm 114. The

forward end of said arm terminates in a head which is divided or split, providing parallel portions 115. The divided head partly surrounds the rock shaft and is clamped or fixed thereto by a screw 116 which connectsthe bifurcated portion 115 and draws them toward each other clamping the arm 114 to the rock shaft 112 so that rotary movements are communicated from the rock shaft to said arm when the space key 110 is actuated. Downward actuations of the space key are limited by a stop, device 117 secured to the frame part 2. The rear portion of the arm 114 iscurved or bent upward and forward and terminates in an enlargement or head 114. The end or head 114 is adapted to coiiperate with the free end of an arm 118. As best appears from Figs. 1-6, said arm extends rearward and is bent upward at right angles, terminating in a triangular ear or offset 119 which lies in a fore andaft plane adjacent to the left-hand side of the dog rocker. The forward end of the ear 119 is perforated to receive a headed and shouldered screw 120 which is threaded into an ear 46 on the rocker plate 46, a check nut 121 coiiperating with the side of the lug 46 to hold the screw 120 in fixed relationship to its support." The ear 119 is loosely confined between the head of the shouldered screw 120 and the check nut 121 and bears freely on the shouldered portion of said screw which provides an axis on which the arm 118, 119 may. be swung while the rocker part 44, carrying said screw 120, remains stationary. Pro]ect1ng inward or toward the right from the top portion of the ear 119 is an actuating device or pin 122 which by the swinging of the arm 118, 119 is caused to coiiperate with the front face of the left-hand offset portion of the rocker plate 59 below the finger or extension 76 to swing the part 45 on the shaft 58 away from and independently of the rocker part 44 to limit the swinging movement of the arm 118. There is preferably provided a yielding stop in the form of a leaf spring 123 which as appears from Figs. 1, 2 and 3, is attached at its lower end to the back of the vertical portion of the arm 118 by a screw 124. The leaf spring extends upward from the screw 124 and its free end is adapted to engage with the front of the stop 86 just prior to the end of the escapement movement, so that the spring stop 123 is slightly flexed at the end of said movement for the purpose of starting a quick return of the parts when the forward swing of the dog rocker part 45 begins. The spring stop 123 also serves indirectly as a stop for the backward swinging movement of the rocker part 45 since such swinging movement is in opposition to the spring 89 at all sta es and only takes place because of the bac ward pressure exerted by the pin 122. Consequently when said pin is arrested by the stop 86 the rocker part 45 will also cease from movement toward the rear.

When the space key 110 is actuated or depressed it will swing the levers 111 downward, rocking the shaft 112 and swinging the arm 114 upward so that the head 114 will press-up against the free end of the arm 118, turning said arm on the pivotal axis 120 and causing the actuating pin 122 to swing rearward about said axis. Said pin acting against the front side of the plate 59 will overcome the spring 89 by stretching said spring and swinging the rocker part 45 rearward about the pivotal axis 120 and away from the rocker part 44 which will remain undisturbed in normal position, as will be understood from a comparison of Figs. 6 and 7, Fig.6 showing the normal position of the parts and corresponding to Figs. 1, 2, 3 and 11, while Fig. 7 shows the abnormal or actuated position of the parts under operation of the space key. Figs. 5 and 12 further illustrate the position of the parts when the rocker member 45 has been swung rearward on the depression of the space key. As the rocker part 45 is swung rearward under actuation of the space key, the stepping or loose dog member 61-64 and the dog member 67, 7 0 will be swung rearward with it, the stepping dog member being carried rearward out of the plane of the escapement wheel and the third dog being carried into the plane of said wheel, the two dogs being so related that before the stepping dog tooth 64 disengages from the wheel tooth 41 the third dog 7 0' will engage with said tooth, the result being that as soon as the stepping dog has cleared said tooth 41, the main spring of the machine acting through the wheel 40 will overcome the spring 66 and swing the dog member 67, 7 0 on its pivot 69 rightward, or toward the left as viewed from the rear in Figs. 5, 11 and 12. During this swing of the member 66, its extension or stop portion 72 will pick up the dog member 61 and will act to swing the stepping dog proper 64 back on its pivot 62 and into engagement with the rounded portion of the stop 73. Said stop by arresting the dog arm 63 causes it to act as a stop for the lug or engaging portion 72, and through it for the member 67 whose turning movement on its pivot 69 will thus be limited. The parts are so proportioned that when the member 67 is thus arrested, the tooth 70 will have swung far enough to permit the escapement wheel to turn a letter space distance, this movement of course being transmitted to the carriage through the described train of connections, the result being that the carriage will move one letter space toward the left during the depression of the space key 110. The spacing frame may be provided with suitable spring restoris released the spacing frame and the arm 114 will .be restored to normal position and as this occurs the dog rocker part 45 will also be permitted to be restored to normal position under the pull of its spring 89, said part swinging forward about the 'lvotal axis 58 until the stop 75 contacts with the face of the plate'46 which has rema ned stationary through the whole operation and acts to arrest the rocker part 45 in normal position. The spring 123 which has been slightly flexed as described serves to facilitate the startin' of the arm 118 and pm 122 and consequent y permits the prompt starting of the rocker part 45 toward normal position under the pull of its spring 89, thus conducing to a rapid operation of the mechanism. As the rocker part swings back to normal position the dog tooth 64 w1ll enter the plane of the escapement wheel just forward of the tooth 41 following that with which said dog had previously engaged, clearing the working face of said tooth but being contiguous to it so that when the escapement wheel is released by the forwardly swinging dog 70 there will be no advance or drop of the escapement wheel and corresponding movement of the carriage, or' substantially none. As soon as the forward swing of the dog rocker part has carried the dog tooth 70 out of engagement with the escapement wheel the dog member 67, 70 will be swung by the spring 66 back into engagement with the top'edge or corner of the stop 73. Thus the vibratory or full back-and-forward swing of the rocker part 45 is completed, and it will be clear that no movement of the carriage takes place durin the return swing of said rocker part, the ull step or space having occurred during the rearward swing of said part 45, which occurs during the space key depression. During the described operation under actuation of the space key it will be noted that the holding dog 48 remains forwardout of the plane of the escapement wheel 40 and plays no part in the escapement movement.

Various changes may be made without departing from my invention.

What I claim as new and desire to secure by Letters Patent, is

1. In an escapement mechanism for typewriting machines, the combination of a rack member, a dog, a key actuated carrier on which said dog is supported, another dog, a key actuated carrier for said last named dog, and a key which when actuated moves one of said carriers relatively to the other.

2. In an escapement mechanism for typewriting machines, the combination of a dog, a pivoted key actuated rocker onwhich said dog is mounted, a second dog, a second key actuated pivoted rocker on which said secmd dog is mounted, and a key which when traveling ers and the dog carrie by it in- I traveling platen carriage, a toothed escapement wheel connected thereto, two pivoted dog rockers, dog members mounted on said rockers, and ke s, certain of said keys when operated actuating both said dog rockers and certain of said keys when operated actuating only one of saiddog rockers.

4. In an escapement mechanism for typewriting machines, the combination of a traveling platen carriage, a toothed escapement wheel connected thereto, two pivoted dog rockers, dog members mounted on said rockers, and key actuated means operating to move only one of said dog rockers to cause a reverse feed escapement.

5. In an escapement mechanism for typewriting machines, the combination of a traveling platen carriage, a toothed escapement wheel connected thereto, printing keys, two dog rockers having coaxial. pivots and operative by said keys, separate dogs carried by said rockers, a space key, and connections rockers, key actuated means for moving only one of said dog rockers to cause a reverse feed escapement,and ke actuated means for operating both of said og rockers for causing an ordinary or no drop escapement.

7. In an escapement mechanism for typewriting -machines, the combination of a traveling platen carriage, a toothed escapement wheel connected thereto, two pivoted dog rockers, dog members mounted on said rockers, and key actuated means for effecting a relative swinging movement of said rockers away-from each other to cause an escapement operation and the consequent feeding movement of the carriage.

8. In an escapement mechanism for typewriting machines, the combination of a platen carriage,-a toothed escapement w eel connected thereto, two pivoted dog rockers, dog members mounted on said rockers, and key actuated means for effecting a relative swinging movement of said rockers away from each other to cause a feeding movement of the carriage, said movement taking (place during the depression of the actuate key.

9. In an escapement mechanism for typewriting machines, the combination of a traveling platen carriage, a toothed rack connected thereto, two pivoted dog rockers, dog members mounted on said rockers, key

actuated means for operating both of said dog ro kers for causing an ordinary or no drop escapement, and a space key efi'ectlve during its depression on one of said rockers 'to cause an escapement operation and the of the actuated printing key.

11. In an escapement mechanism for typewriting machines, the combination of a traveling platen carriage, a toothed rack connected thereto, twopivoted dog rockers, dog members mounted on said rockers, a space key effective to operate only one of said dog rockers to cause a feeding movement of the carriage, type bars, and printing keys connected to said type bars and effective when depressed to actuate said type bars, said prlnting keys being also effective during their return strokes to act on. both of said dog rockers to cause an escapement operation and the consequent feeding movement of the carriage.

12. In a carriage feeding mechanism for a typewriting machine, the combination of an escapement rack, a two-part dog rocker, a holding dog on one of said rocker parts, a stepping dog pivoted on the other of said rocker parts, and a third dog on the other of said rocker parts, certain of the keys of the machine being effective to cause relative movement between said rocker parts to bring said third dog into use, said third dog controlling movements of said stepping. dog.

13. In a carriage feeding mechanism for a typewriting machine, the combination of an escapement wheel, a two-part dog rocker, a holding dog on one of said rocker parts, a stepping dog on the other of said rocker parts, and a third dog on the other of said rocker parts, said third dog being pivotally mounted and being connected by a spring with said stepping dog, said spring tending to maintain said stepping dog engaged with 3 stop portion or projection on said third 14. In a carriage feeding mechanism for a typewriting machine, the combination of an escapement wheel, a stepping dog normally engaged therewith, a holding dog, a third dog, means for moving said stepping dog and said holding dog transversely of the escapement wheel 'to afford step-by-step movements of the carriage, and means for moving said stepping dog and said third dog transversely of the escapement wheel inde pendently of the holding dog to effect stepby-step movements of the carriage.

15. In a carriage feeding mechanism for a typewriting machine, the combination of an escapement wheel, a stepping dog normally engaged therewith, a holding dog, a third do printing keys, a space key, means contro led by said printing keys for moving said stepping dog and said holding dog transversely of the escapement wheel to afford step-by-step movements of the carriage, and means controlled by said space key for moving said stepping dog and said third dog transversely of the escapement wheel independently of the holding dog to effect stepby-step movements of the carriage.

16. In a carriage feeding mechanism for a typewriting machine, the combination of an escapement wheel, a pivoted plate, a holding dog thereon, a second plate pivoted to the first plate, a spring pressed stepping dog pivoted on said second plate, a third dog pivoted on said second late, printing keys connected to operate 0th said pivoted plates, and a space key connected to operate the second only of said pivoted plates independently of movement of said first named plate.

17. In'a carriage feeding mechanism for a typewriting machine, the combination of an escapement wheel, a pivoted plate, a holding dog thereon, a second plate pivoted to the first plate, a s ring ressed ste pin do pivoted on said s econd plate, a thir d do g piv oted onsaid second plate, a stop, a spring for maintaining both plates'in a position determined by said stop, and a second spring for maintaining a mutual relationship between said plates.

18. In a carriage'feeding mechanism for a typewriting machine, the combination of an escapement wheel, a pivoted plate, a holding dog thereon, a second plate pivoted to the first plate, a spring pressed stepping dog pivoted on said second plate, a third dog pivoted on said second plate, printing keys, type bars connected to said printing keys, a universal bar actuated when said printing keys are operated, said universal bar being effective to actuate said first recited pivoted plate, and a space key effective to operate only the second pivoted plate.

19. In a carriage feeding mechanism for a typewriting machine, the combination of an escapement rack, a movable plate, a holding dog thereon, a second plate mounted to the first plate, a spring pressed stepping dog on said second plate, a third dog on said second plate, printing keys connected to operate both said plates, a space key, a rock shaft actuated thereby, an arm fixed to said rock shaft, an arm pivoted to said first recited plate and operative by said first recited arm, and an actuating device on said pivoted arm effective on said second named plate to move it relatively to said first named plate.

20. In an escapement mechanism for ty ewriting machines, the combination of a 0g rocker comprising two leaves hinged together, dogs onboth leaves, one of said dogs eing inoperative when both leaves of said rocker are rocked together, and means for spreading said leaves to bring into use said last named inoperative dog.

21. In an escapement mechanism for type- 15 writing machines, the combination of a dog rocker comprising two parts hinged together, dogs on both parts, and means for mani ulating said parts to bring certain of said ogs into and out of use during escape- 20 ment operations.

Signed at Lancaster, 1 in the county of Lancaster and State of Pennsylvania, this 5th day of November A. D. 1920.

AR'I HUR J. DUDLEY.

Witnesses:

F. S. EsHLnMAN, E. W. ESHLEMAN. 

